arXiv subjects

Katsumi Senyo

Publications and source records attributed to Katsumi Senyo.

2 recordsLinked to original sources

arXiv2010

Recent results on $ϕ_3$ at Belle

We report results of measurement of the unitarity triangle angle $ϕ_3$ with $B^+\rightarrow D^{(*)}K^+$ Dalitz plot analysis and related issues with $B^0 \rightarrow D_s^{*+} π^-$ and $B^0 \rightarrow D_s^{*-} K^+$ decay processes. The Dalitz analysis improves accuracy of the angle $ϕ_3$ as $78.4^\circ ~^{+10.8^\circ}_{-11.6^\circ}\pm 3.6^\circ\pm 8.9^\circ$ and the branching fractions are found to be $B^0 \rightarrow D_s^{*+} π^-(K^-)$ decays are set as $\mathcal{B}(B^0 \rightarrow D_s^{*+} π^-) = (1.75 \pm 0.34 (\mathrm{stat}) \pm 0.17(\mathrm{syst}) \pm 0.11(\mathcal{B})) \times 10^{-5}$ and $\mathcal{B}(B^0 \rightarrow D_s^{*-} K^+) = (2.02 \pm 0.33 (\mathrm{stat}) \pm 0.18({\rm syst}) \pm 0.13(\mathcal{B})) \times 10^{-5}$.

hep-ex↗

arXiv2005

Search for new physics in B -> VV decays and other hot topics from Belle

We report studies in polarization in B decay into two vector mesons with data equivalent to $253 {\rm fb^{-1}}$ on $Υ(4S)$ resonance at KEKB. In $B^0 \to ϕK^{*0}$, $B^+ \to ϕK^{*+}$ and $B^+ \to ρ^+ K^{*0}$ decays, we determine $f_L = 0.45 \pm 0.05({\rm stat.}) \pm 0.02({\rm syst.})$, $f_L = 0.52 \pm 0.08({\rm stat.}) \pm 0.03({\rm syst.})$ and $f_L = 0.43 \pm 0.11({\rm stat.}) ^{+ 0.05}_{-0.02}({\rm syst.})$ respectively, where $f_L$ is a ratio between longitudinal and transverse polarization, and a naïve theoretical estimation assumes $f_L \sim 1$. The discrepancy from 1 in $f_L$ may suggest existence of new amplitude within or/and beyond the Standard Model.

hep-ex↗